道與魔:SqlServer存儲過程/函數加/解密

Copyright@ ♂猜猜♂&J9988 2005. All rights reserved

　　存儲過程、存儲函數的加密：WITH ENCRYPTION

begin tran

declare @objectname1 varchar(100),@orgvarbin varbinary(8000)

declare @sql1 nvarchar(4000),@sql2 varchar(8000),@sql3 nvarchar(4000),@sql4 nvarchar(4000)

DECLARE @OrigSpText1 nvarchar(4000), @OrigSpText2 nvarchar(4000) , @OrigSpText3 nvarchar(4000), @resultsp nvarchar(4000)

declare @i int,@status int,@type varchar(10),@parentid int

declare @colid int,@n int,@q int,@j int,@k int,@encrypted int,@number int

select @type=xtype,@parentid=parent_obj from sysobjects where id=object_id(@ObjectName)



create table #temp(number int,colid int,ctext varbinary(8000),encrypted int,status int)

insert #temp SELECT number,colid,ctext,encrypted,status FROM syscomments WHERE id = object_id(@objectName)

select @number=max(number) from #temp

set @k=0



while @k<=@number

begin

if exists(select 1 from syscomments where id=object_id(@objectname) and number=@k)

begin

if @type='P'

set @sql1=(case when @number>1 then 'ALTER PROCEDURE '+ @objectName +';'+rtrim(@k)+' WITH ENCRYPTION AS '

else 'ALTER PROCEDURE '+ @objectName+' WITH ENCRYPTION AS '

end)



if @type='TR'

begin

declare @parent_obj varchar(255),@tr_parent_xtype varchar(10)

select @parent_obj=parent_obj from sysobjects where id=object_id(@objectName)

select @tr_parent_xtype=xtype from sysobjects where id=@parent_obj

if @tr_parent_xtype='V'

begin

set @sql1='ALTER TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION INSTERD OF INSERT AS PRINT 1 '

end

else

begin

set @sql1='ALTER TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION FOR INSERT AS PRINT 1 '

end



end

if @type='FN' or @type='TF' or @type='IF'

set @sql1=(case @type when 'TF' then

'ALTER FUNCTION '+ @objectName+'(@a char(1)) returns @b table(a varchar(10)) with encryption as begin insert @b select @a return end '

when 'FN' then

'ALTER FUNCTION

'+ @objectName+'(@a char(1)) returns char(1) with encryption as begin return @a end'

when 'IF' then

'ALTER FUNCTION '+ @objectName+'(@a ch

您正在看的SQLserver教程是:道與魔:SqlServer存儲過程/函數加/解密。ar(1)) returns table with encryption as return select @a as a'

end)



if @type='V'

set @sql1='ALTER VIEW '+@objectname+' WITH ENCRYPTION AS SELECT 1 as f'



set @q=len(@sql1)

set @sql1=@sql1+REPLICATE('-',4000-@q)

select @sql2=REPLICATE('-',8000)

set @sql3='exec(@sql1'

select @colid=max(colid) from #temp where number=@k

set @n=1

while @n<=CEILING(1.0*(@colid-1)/2) and len(@sQL3)<=3996

begin

set @sql3=@sql3+'+@'

set @n=@n+1

end

set @sql3=@sql3+')'

exec sp_executesql @sql3,N'@sql1 nvarchar(4000),@ varchar(8000)',@sql1=@sql1,@=@sql2



end

set @k=@k+1

end



set @k=0

while @k<=@number

begin



if exists(select 1 from syscomments where id=object_id(@objectname) and number=@k)

begin

select @colid=max(colid) from #temp where number=@k

set @n=1



while @n<=@colid

begin

select @OrigSpText1=ctext,@encrypted=encrypted,@status=status FROM #temp WHERE colid=@n and number=@k



SET @OrigSpText3=(SELECT ctext FROM syscomments WHERE id=object_id(@objectName) and colid=@n and number=@k)

if @n=1

begin

if @type='P'

SET @OrigSpText2=(case when @number>1 then 'CREATE PROCEDURE '+ @objectName +';'+rtrim(@k)+' WITH ENCRYPTION AS '

else 'CREATE PROCEDURE '+ @objectName +' WITH ENCRYPTION AS '

end)



if @type='FN' or @type='TF' or @type='IF'

SET @OrigSpText2=(case @type when 'TF' then

'CREATE FUNCTION '+ @objectName+'(@a char(1)) returns @b table(a varchar(10)) with encryption as begin insert @b select @a return end '

when 'FN' then

'CREATE FUNCTION '+ @objectName+'(@a char(1)) returns char(1) with encryption as begin return @a end'

when 'IF' then

'CREATE FUNCTION '+ @objectName+'(@a char(1)) returns table with encryption as return select @a as a'

end)



if @type='TR'

begin



if @tr_parent_xtype='V'

begin

set @OrigSpText2='CREATE TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION INSTEAD OF INSERT AS PRINT 1 '

end

else

begin

set @OrigSpText2='CREATE TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION FOR INSERT AS PRINT 1 '

end



end



if @type='V'

set @OrigSpText2='CREATE VIEW '+@objectname+' WITH ENCRYPTION AS SELECT 1 as f'



set @q=4000-len(@OrigSpText2)

set @OrigSpText2=@OrigSpText2+REPLICATE('-',@q)

end

else

begin

SET @OrigSpText2=REPLICATE('-', 4000)

end

SET @i=1



SET @resultsp = replicate(N'A', (datalength(@OrigSpText1) / 2))



WHILE @i<=datalength(@OrigSpText1)/2

BEGIN



SET @resultsp = stuff(@resultsp, @i, 1, NCHAR(UNICODE(substring(@OrigSpText1, @i, 1)) ^

(UNICODE(substring(@OrigSpText2, @i, 1)) ^

UNICODE(substring(@OrigSpText3, @i, 1)))))

SET @i=@i+1

END

set @orgvarbin

=cast(@OrigSpText1 as varbinary(8000))

set @resultsp=(case when @encrypted=1

then @resultsp

else convert(nvarchar(4000),case when @status&2=2 then uncompress(@orgvarbin) else @orgvarbin end)

end)

print @resultsp



set @n=@n+1

end



end

set @k=@k+1

end



drop table #temp

rollback tran

end